The initiation ceremony, having its roots in the first steps of humanity in rituals of introduction and acceptance of new members in each race and social group, was transformed over time into a purely religious event, which was the introduction to the Greek, Hellenistic and Roman world in all the mystical and mystical cults addressed to the restless spirits who sought a direct contact, "intoxication", with the Divine. One of the later mystics was the emperor Julian, who was initiated into several of the mysteries of the ancient world.